package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;
import static com.hmdp.utils.RedisConstants.LOGIN_USER_TTL;

/**
 * <p>
 * 登录拦截器
 * </p>
 *
 * @author: DJ
 * @Date: 19:52 2022/10/27
 */
public class RefreshTokenInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 1.从请求头header获取token
        String token = request.getHeader(SystemConstants.AUTHORIZATION);
        if (StrUtil.isBlank(token)) {
            return true;
        }
        // 2.从redis中获取用户信息
        Map<Object, Object> userDTOMap = stringRedisTemplate.opsForHash().entries(LOGIN_USER_KEY + token);
        // 3.map转换为userDTO对象
        UserDTO user = BeanUtil.fillBeanWithMap(userDTOMap, new UserDTO(), false);
        // 4.保存用户信息到ThreadLocal
        UserHolder.saveUser(user);
        // 5.刷新过期时间
        stringRedisTemplate.expire(LOGIN_USER_KEY + token, LOGIN_USER_TTL, TimeUnit.MINUTES);
        // 6.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        // 移除用户
        UserHolder.removeUser();
    }
}
